In calcareous meadows or calcoreous swamps and seepage areas, reported 

 from Bryan Co., Okla. by Waterfall; Nfld. to Sask., s. to N.J., Pa., Va., Tenn., 

 Mo., Okla. and S.D. 



7 Rhynchospora glomerata (L). Vahl. Fig. 244. 



Tufted perennial; culms 6-11 dm. long, erect, 2-3.5 mm. thick basally, tri- 

 quetrous, leafy; larger leaves 5-6 mm. broad near the base of the plant; inflores- 

 cence variable, either of a number of subcapitate glomerules scattered along the 

 upper half of the culm ("var. glomerata") or a few more discretely grouped 

 glomerules ("var. angusta Gale"): spikelets lanceolate, 4.5-6 mm. long, rich- 

 dark-brown, with usually 2 fruits (less commonly 3 or 1, if wath 1 then with a 

 terminal rudimentary flower); bristles about 6, exceeding the achene and often 

 about equaling the tubercle, somewhat dorsiventrally compressed, conspicuously 

 retrorsely barbed; achenial body pyriform, 1.5-1.7 mm. long, the 2 sides with an 

 abruptly raised central hump which is polished and buffy, contrasting with the 

 dark-chestnut-brown submarginal flat portion, the margins themselves pale like the 

 umbo; tubercle 1.3-1.8 mm. long, elongate-deltoid, much compressed, grayish. 



In moist sand, wet sandy drainage area, ponds on edge of woods, in water of 

 seepage bog, in Okla. (LeFlore, McCurtain, pushmataha and Pittsburg cos.), 

 frequent in e. Tex., infrequent in s.e. Tex., summer; Gulf States, n. to Del., Va., 

 Tenn. and Ark., w. to Okla. and Tex. 



8. Rhynchospora capitellata (Michx.) Vahl. Fig. 245. 



Tufted perennial; culms 2-9 dm. long, erect, 1-2 mm. thick basally, bluntly 

 3-angled, leafy; larger leaves 2-3 mm. broad near the base of the plant; inflores- 

 cence of a few turbinate fascicles scattered along the uppor half of the culm; 

 spikelets lanceolate, 3.5-5 mm. long, usually with 2 fruits (less commonly 3 or 1, 

 if with 1 then also with a terminal rudimentary flower); bristles about 6, exceeding 

 the achene, usually about equaling the tubercle, somewhat dorsiventrally com- 

 pressed, conspicuously retrorsely barbed; achenial body pyriform or obovate, 

 basally cuneate, 1.3-1.6 mm. long, the 2 sides merely convex (the central portions 

 paler, grading off into the darker brown submarginal zones, the margins themselves 

 pale like the center); tubercle elongate-deltoid, 0.9-1.6 mm. long, grayish, much- 

 compressed. 



On banks of streams and spring branches and wet places in uplands, infrequent 

 or rare in Okla. (Adair and McCurtain cos.) and e. Tex. (Austin, Guadalupe, 

 Angelina, Henderson and Leon cos.), apparently always in acid boggy ground, 

 summer; e. U.S. n.e. to N.S., w. to Wise, Mo., Okla. and Tex. 



9. Rhynchospora macra (Clarke) Small. Fig. 245. 



Tufted (?) or with rhizomes about 1 mm. thick; culms 3-7 dm. long, erect, 

 triquetrous, 1.5-2 mm. thick near the base; leaves several, the blades 2-3.5 mm. 

 broad near the base of the plant; inflorescence primarily a large terminal turbinate- 

 corymbose fascicle 1-3 cm. broad, 1 or 2 extremly reduced axillary fascicles 

 also present; spikelets linear-lanceolate, 4-5 mm. long, pale brown, each with a 

 single fertile flower and never a higher rudimentary one; bristles 10 to 20 per 

 achene, much-surpassing the body, conspicuously retrorsely barbed; achenial body 

 pyriform 1.8-2 mm. long, brown (the raised central portions of the 2 sides paler, 

 buffy), the submarginal surfaces with very faint transverse wrinkles; tubercle 

 elongate-deltoid, much-compressed, about 1 mm. long. 



Very rare in bogs in e. Tex. (Houston and Robertson cos.), summer; Ga., Fla., 

 Miss, and Tex. 



475 



